期刊
FOOD CHEMISTRY
卷 321, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2020.126682
关键词
Graphene quantum dots; Nafion; Electrochemical sensor; Square wave anodic stripping voltammetry; Cadmium; Lead
资金
- FONDECYT Chile [1180804, 1160324]
- Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT) [21150868]
- Universidad de Santiago de Chile [1145-USA 1799-1-1-3 VRIDEI]
An inexpensive and environmental friendly electrochemical sensor based on a glassy carbon electrode (GC) modified with graphene quantum dots (GQDs) and Nafion (NF) has been developed for the determination of Cd(II) and Pb(II) in bivalve mollusks using square wave anodic stripping voltammetry (SWASV). GQDs were characterized by UV-Vis spectroscopy, fluorescence and transmission electronic microscopy (TEM). The modified electrode was evaluated by cyclic voltammetry, scanning electronic microscopy (SEM) and electrochemical impedance spectroscopy (EIS). A linearity of 20-200 mu g L-1 was found, with a limit of detection (LOD) of 11.30 mu g L-1 for Cd(II) and 8.49 mu g L-1 for Pb(II). The proposed methodology was validated with a certified reference material TMDA-64.2. The reproducibility of GC/GQDs-NF for both species had an RSD of less than 10%. The results were compared with ICP-OES. The method was applied in the determination of Cd(II) and Pb(II) in bivalve mollusks samples with excellent results.
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